Paragraphs
54·57
breaker points just start to open, then
tighten distributor clamp screw enough
to hold distributor position. Start engine
and check running timing at high idle
no-load rpm.
54. OVERHAUL. Refer to Fig. 56 for
exploded view ofthe Prestolite 1BT-4406
d
is
tributor used on all models.
Disassembly is by removing breaker
p
l
ate (6), clip (7) and pin (21).
Assemble parts (8,9,10,11 and 12) as
shown in Fig. 57, then install snap ring
(7 -Fig. 56). The shouldered washer 04)
should be above and should enclose nat
washer (15). Distributor shaft end play
should be 0-0.25 mm (0-0.010 inch).
Breaker point gap of 0.43-0.56 mm
Fig. 57-Lugs on cam
assembly (8) should go
through •prlngs (11 end 12),
weights (10) end
slots
In plate
of the distributor sheft.
Spacer Is shown et
(9).
(0.017-0.022 inch) should provide dwell
of 66-72 degrees. Breaker point spring
tension should be 4.7-6.1
N
{17-22
ounces).
Delco-Remy 1115065 ignition coil
is
used on all models. Primary winding
resistance should be 3.3-4.1 ohms at
24
oc
(75 °F). Secondary winding at the
same temperature should be 3000-20000
ohms.
55. SPARK PLUGS. Recommended
spark plugs are Champion RD-16,
Massey-Ferguson MF834242 Ml or
equivalent. Electrode gap should be 0.64
mm (0.025 inch). Manufacturer recom
mends renewing spark plugs after every
300 hours of operation.
DIESEL ENGINE AND COMPONENTS
All models equipped with diesel
engine use Perkins AD3.152 direct injec
tion diesel engine. Different versions of
the AD3.152 engine have been used and
can be identified by the serial number
suffix letters stamped on pad located
near the fuel transfer pump on right side
of engine. Some service procedures will
differ slightly depending on whether or
not there is an "S" in serial number suf
fix letters. Engines with letter
"C'
in suf
fix code use a one-piece lip type
crankshaft rear oil seal. Engines that
do
not have Jetter
"C'
in suffix code use a
two-piece rope type crankshaft rear oil
seal.
R&R ENGINE ASSEMBLY
All Diesel Mode
l
s
56.
Th
remove engine, first remove
front end assembly from engine as
follows: Drain cooling system. Remove
hood, grille, side panels and radiator
brace. Disconnect battery cables and
remove the battery. Disconnect
28
headlight wires and thread wiring rear
ward through the retainer clips. Discon
nect radiator upper and lower hoses, oi
I
cooler hoses and power steering hoses.
Disconnect drag links from steering box
pitman arms. Drive wooden wedges be·
tween front axle and axle support to pre
vent tipping. Remove front end weights
if so equipped. Support front end
assembly with a hoist. Support tractor
Fig. 58-0n early production
engines (prior
to
Serial No.
152UA 2841 1DSL), use
se
quence shown when tighten
Ing cylinder head cap screws.
Reverse the sequence when
loosening cap screws.
MASSEY -FERGUSON
with a jack stand under transmission
housing. Remove bolts attaching axle
support to front
of
engine, then roll front
end assembly away from engine.
Th
separate engine from transmission,
proceed
as
follows: Shut
off
fuel, discon
nect fuel lines and remove fuel tank.
Disconnect air cleaner hose. Disconnect
injection pump stop control and throttle
control. Disconnect wiring from engine
and starter motor. Remove starter motor
and solenoid. Disconnect tachometer
drive cable from engine. Remove bolts at
taching steering box side panels to rear
of engine. Remove muffier (or exhaust
pipe) from exhaust
man
ifold. Support
engine with a hoist, remove bolts at
taching engine to transmission and
carefully move engine forward from
transmission.
To
reinstall engine, reverse the
r•emoval procedure while noting the
following special instructions: Insiall an
alignment stud in each side of transmis
sion housing to assist in aligning engine
to transmission. Turn nywheel to align
clutch plate splines with transmission
and pto input shaft splines. After engine
and transmission flanges meet,
install
retaining bolts and nuts and tighten to
75
N
·
m (55 ft.-lbs.) torque. Tighten front
axle support mounting bolts and nuts to
235
N
·
m (175 ft.-lbs.> torque. Check
clutch linkage acljustment as outlined in
appropriate paragraph 110 or 111.
CYLINDER HEAD
All Diesel Models
57. REMOVE AND
REINSfALL. Th
remove cylinder head,
first
drain
cooling
system. Remove hood and instrument
panel cover. Disconnect battery cables
and remove battery. Shut
off
fuel, discon
nect fuel gage sending unit wire, discon
nect fuel supply and return lines, and
remove fuel tank and mounting
brackets. Disconnect radiator top bose
and thermostat bypass hose. Disconnect
breather pipe and remove rocker
arm
cover. Remove retaining nuts and lift ofT